<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ajax取消请求</title>
</head>
<body>
    <Button>click</Button>
    <Button>cacel</Button>
    <script>
        const btns = document.querySelectorAll('button');
        let x = null;

        btns[0].onclick = function () {
            const x = new XMLHttpRequest();

            x.open("GET",'http://127.0.0.1:8000/delay');

            x.send();
        }
        

        btns[1].onclick = function () {
             x = new XMLHttpRequest();

            x.abort();
        }
    </script>
</body>
</html>